Well I'm kinda glad they didn't actually film something like that, because it is very Blink. That said my throat did get a little tight when Arthur was reading, and it's sweet to think they ended up adopting.

I almost wonder if there would be a way to film it and edit it in with the original ending of the episode. Maybe somehow find a way to cut back and forth between Rory's letter to his dad and Amy's letter to the Doctor?

I think had it been filmed there would've been a better since of closure for the episode and the Ponds' journey. Plus, made some sense of having Brian introduced in the first place. I think I for one would've liked it better had it been included. I know not everything needs a pat ending but at the same time it's kind of nice to have a last hurrah for the characters we spent time getting to know and like.

Strange Chibnall wrote it, so was it ever intended to be aired or was it just a coda he thought to add?